Publications


Transport coefficients of a relativistic plasma.

Physical review. E 93 (2016) 053208-

OJ Pike, SJ Rose

In this work, a self-consistent transport theory for a relativistic plasma is developed. Using the notation of Braginskii [S. I. Braginskii, in Reviews of Plasma Physics, edited by M. A. Leontovich (Consultants Bureau, New York, 1965), Vol. 1, p. 174], we provide semianalytical forms of the electrical resistivity, thermoelectric, and thermal conductivity tensors for a Lorentzian plasma in a magnetic field. This treatment is then generalized to plasmas with arbitrary atomic number by numerically solving the linearized Boltzmann equation. The corresponding transport coefficients are fitted by rational functions in order to make them suitable for use in radiation-hydrodynamic simulations and transport calculations. Within the confines of linear transport theory and on the assumption that the plasma is optically thin, our results are valid for temperatures up to a few MeV. By contrast, classical transport theory begins to incur significant errors above k_{B}T∼10 keV, e.g., the parallel thermal conductivity is suppressed by 15% at k_{B}T=20 keV due to relativistic effects.


OBSERVATION and CHARACTERIZATION of A COSMIC MUON NEUTRINO FLUX from the NORTHERN HEMISPHERE USING SIX YEARS of ICECUBE DATA

Astrophysical Journal 833 (2016)

MG Aartsen, K Abraham, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, D Altmann, K Andeen, T Anderson, I Ansseau, G Anton, M Archinger, C Argüelles, J Auffenberg, S Axani, X Bai, SW Barwick, V Baum, R Bay, JJ Beatty, JB Tjus, KH Becker, S Benzvi, P Berghaus, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissok, E Blaufuss, S Blot, C Bohm, M Börner, F Bos, D Bose, S Böser, O Botner, J Braun, L Brayeur, HP Bretz, A Burgman, T Carver, M Casier, E Cheung, D Chirkin, A Christov, K Clark, L Classen, S Coenders, GH Collin, JM Conrad, DF Cowen, R Cross, M Day, JPAMD André, CD Clercq, EDP Rosendo, H Dembinski, SD Ridder, P Desiati, KDD Vries, GD Wasseige, MD With, T Deyoung, JC Díaz-Vélez, VD Lorenzo, H Dujmovic, JP Dumm, M Dunkman, B Eberhardt, T Ehrhardt, B Eichmann, P Eller, S Euler, PA Evenson, S Fahey, AR Fazely, J Feintzeig, J Felde, K Filimonov, C Finley, S Flis, CC Fösig, A Franckowiak, E Friedman, T Fuchs, TK Gaisser, J Gallagher, L Gerhardt, K Ghorbani, W Giang, L Gladstone, M Glagla

© 2016. The American Astronomical Society. All rights reserved.The IceCube Collaboration has previously discovered a high-energy astrophysical neutrino flux using neutrino events with interaction vertices contained within the instrumented volume of the IceCube detector. We present a complementary measurement using charged current muon neutrino events where the interaction vertex can be outside this volume. As a consequence of the large muon range the effective area is significantly larger but the field of view is restricted to the Northern Hemisphere. IceCube data from 2009 through 2015 have been analyzed using a likelihood approach based on the reconstructed muon energy and zenith angle. At the highest neutrino energies between 194 TeV and 7.8 PeV a significant astrophysical contribution is observed, excluding a purely atmospheric origin of these events at 5.6s significance. The data are well described by an isotropic, unbroken power-law flux with a normalization at 100 TeV neutrino energy of (0.90 -0.27+0.30) × 10-18 Gev-1 cm-2 s-1 sr-1and a hard spectral index of γ = 2.13 ± 0.13. The observed spectrum is harder in comparison to previous IceCube analyses with lower energy thresholds which may indicate a break in the astrophysical neutrino spectrum of unknown origin. The highest-energy event observed has a reconstructed muon energy of (4.5 ± 1.2) PeV which implies a probability of less than 0.005% for this event to be of atmospheric origin. Analyzing the arrival directions of all events with reconstructed muon energies above 200 TeV no correlation with known γ-ray sources was found. Using the high statistics of atmospheric neutrinos we report the current best constraints on a prompt atmospheric muon neutrino flux originating from charmed meson decays which is below 1.06 in units of the flux normalization of the model in Enberg et al.


Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2016) ARTN 037

MG Aartsen, K Abraham, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, D Altmann, T Anderson, I Ansseau, M Archinger, C Arguelles, TC Arlen, J Auffenberg, X Bai, SW Barwick, V Baum, R Bay, JJ Beatty, JB Tjus, K-H Becker, E Beiser, P Berghaus, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissok, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, M Boerner, F Bos, D Bose, S Boeser, O Botner, J Braun, L Brayeur, H-P Bretz, N Buzinsky, J Casey, M Casier, E Cheung, D Chirkin, A Christov, K Clark, L Classen, S Coenders, DF Cowen, AHC Silva, J Daughhetee, JC Davis, M Day, JPAM de Andre, C De Clercq, EDP Rosendo, H Dembinski, S De Ridder, P Desiati, KD de Vries, G de Wasseige, M de With, T DeYoung, JC Diaz-Velez, V di Lorenzo, JP Dumm, M Dunkman, B Eberhardt, T Ehrhardt, B Eichmann, S Euler, PA Evenson, S Fahey, AR Fazely, J Feintzeig, J Felde, K Filimonov, C Finley, T Fischer-Wasels, S Flis, C-C Foesig, T Fuchs, TK Gaisser, R Gaior, J Gallagher, L Gerhardt, K Ghorbani, D Gier, L Gladstone, M Glagla, T Gluesenkamp, A Goldschmidt, G Golup, JG Gonzalez, D Gora, D Grant, Z Griffith, A Gross, C Ha, C Haack, AH Ismail, A Hallgren, F Halzen, E Hansen, B Hansmann, K Hanson, D Hebecker, D Heereman, K Helbing, R Hellauer, S Hickford, J Hignight, GC Hill, KD Hoffman, R Hoffmann, K Holzapfel, A Homeier, K Hoshina, F Huang, M Huber, W Huelsnitz, PO Hulth, K Hultqvist, S In, A Ishihara, E Jacobi, GS Japaridze, M Jeong, K Jero, M Jurkovic, A Kappes, T Karg, A Karle, M Kauer, A Keivani, JL Kelley, J Kemp, A Kheirandish, J Kiryluk, J Klaes, SR Klein, G Kohnen, R Koirala, H Kolanoski, R Konietz, L Koepke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, K Krings, G Kroll, M Kroll, G Krueckl, J Kunnen, N Kurahashi, T Kuwabara, M Labare, JL Lanfranchi, MJ Larson, M Lesiak-Bzdak, M Leuermann, J Leuner, L Lu, J Luenemann, J Madsen, G Maggi, KBM Mahn, M Mandelartz, R Maruyama, K Mase, HS Matis, R Maunu, F McNally, K Meagher, M Medici, A Meli, T Menne, G Merino, T Meures, S Miarecki, E Middell, L Mohrmann, T Montaruli, R Morse, R Nahnhauer, U Naumann, G Neer, H Niederhausen, SC Nowicki, DR Nygren, AO Pollmann, A Olivas, A Omairat, A O'Murchadha, T Palczewski, H Pandya, DV Pankova, L Paul, JA Pepper, CP de Los Heros, C Pfendner, D Pieloth, E Pinat, J Posselt, PB Price, GT Przybylski, M Quinnan, C Raab, L Raedel, M Rameez, K Rawlins, R Reimann, M Relich, E Resconi, W Rhode, M Richman, S Richter, B Riedel, S Robertson, M Rongen, C Rott, T Ruhe, D Ryckbosch, L Sabbatini, H-G Sander, A Sandrock, J Sandroos, S Sarkar, K Schatto, M Schimp, T Schmidt, S Schoenen, S Schoeneberg, A Schoenwald, L Schulte, L Schumacher, D Seckel, S Seunarine, D Soldin, M Song, GM Spiczak, C Spiering, M Stahlberg, M Stamatikos, T Stanev, A Stasik, A Steuer, T Stezelberger, RG Stokstad, A Stoessl, R Stroem, NL Strotjohann, GW Sullivan, M Sutherland, H Taavola, I Taboada, J Tatar, S Ter-Antonyan, A Terliuk, G Tesic, S Tilav, PA Toale, MN Tobin, S Toscano, D Tosi, M Tselengidou, A Turcati, E Unger, M Usner, S Vallecorsa, J Vandenbroucke, N van Eijndhoven, S Vanheule, J van Santen, J Veenkamp, M Vehring, M Voge, M Vraeghe, C Walck, A Wallace, M Wallraff, N Wandkowsky, C Weaver, C Wendt, S Westerhoff, BJ Whelan, K Wiebe, CH Wiebusch, L Wille, DR Williams, H Wissing, M Wolf, TR Wood, K Woschnagg, DL Xu, XW Xu, Y Xu, JP Yanez, G Yodh, S Yoshida, M Zoll, A Aab, P Abreu, M Aglietta, EJ Ahn, I Al Samarai, IFM Albuquerque, I Allekotte, P Allison, A Almela, JA Castillo, J Alvarez-Muniz, RA Batista, M Ambrosio, A Aminaei, L Anchordoqui, B Andrada, S Andringa, C Aramo, F Arqueros, N Arsene, H Asorey, P Assis, J Aublin, G Avila, N Awal, AM Badescu, C Baus, JJ Beatty, KH Becker, JA Bellido, C Berat, ME Bertaina, X Bertou, PL Biermann, P Billoir, SG Blaess, A Blanco, M Blanco, J Blazek, C Bleve, H Bluemer, M Bohacova, D Boncioli, C Bonifazi, N Borodai, AM Botti, J Brack, I Brancus, T Bretz, A Bridgeman, FL Briechle, P Buchholz, A Bueno, S Buitink, M Buscemi, KS Caballero-Mora, B Caccianiga, L Caccianiga, M Candusso, L Caramete, R Caruso, A Castellina, G Cataldi, L Cazon, R Cester, AG Chavez, A Chiavassa, JA Chinellato, JCC Diaz, J Chudoba, RW Clay, R Colalillo, A Coleman, L Collica, MR Coluccia, R Conceicao, F Contreras, MJ Cooper, A Cordier, S Coutu, CE Covault, R Dallier, S D'Amico, B Daniel, S Dasso, K Daumiller, BR Dawson, RM de Almeida, SJ de Jong, G De Mauro, JRT de Mello Neto, I De Mitri, J de Oliveira, V de Souza, J Debatin, L del Peral, O Deligny, N Dhital, C Di Giulio, A Di Matteo, MLD Castro, F Diogo, C Dobrigkeit, W Docters, JC D'Olivo, A Dorofeev, RC dos Anjos, MT Dova, A Dundovic, J Ebr, R Engel, M Erdmann, M Erfani, CO Escobar, J Espadanal, A Etchegoyen, H Falcke, K Fang, G Farrar, AC Fauth, N Fazzini, AP Ferguson, B Fick, JM Figueira, A Filevich, A Filipi, O Fratu, MM Freire, T Fujii, A Fuster, F Gallo, B Garcia, D Garcia-Gamez, D Garcia-Pinto, F Gate, H Gemmeke, A Gherghel-Lascu, PL Ghia, U Giaccari, M Giammarchi, M Giller, D Glas, C Glaser, H Glass, G Golup, M Gomez Berisso, PF Gomez Vitale, N Gonzalez, B Gookin, J Gordon, A Gorgi, P Gorham, P Gouffon, N Griffith, AF Grillo, TD Grubb, F Guarino, GP Guedes, MR Hampel, P Hansen, D Harari, TA Harrison, JL Harton, Q Hasankiadeh, A Haungs, T Hebbeker, D Heck, P Heimann, AE Herve, GC Hill, C Hojvat, N Hollon, E Holt, P Homola, JR Hoerandel, P Horvath, M Hrabovsksy, T Huege, A Insolia, PG Isar, I Jandt, S Jansen, C Jarne, JA Johnsen, M Josebachuili, A Kaeaepae, O Kambeitz, KH Kampert, P Kasper, I Katkov, B Keilhauer, E Kemp, RM Kieckhafer, HO Klages, M Kleifges, J Kleinfeller, R Krause, N Krohm, D Kuempel, GK Mezek, N Kunka, AK Awad, D LaHurd, L Latronico, R Lauer, M Lauscher, P Lautridou, D Lebrun, P Lebrun, MA Leigui de Oliveira, A Letessier-Selvon, I Lhenry-Yvon, K Link, L Lopes, R Lopez, A Lopez Casado, A Lucero, M Malacari, M Mallamaci, D Mandat, P Mantsch, AG Mariazzi, V Marin, IC Maris, G Marsella, D Martello, H Martinez, OM Bravo, JJM Meza, HJ Mathes, S Mathys, J Matthews, JAJ Matthews, G Matthiae, D Maurizio, E Mayotte, PO Mazur, C Medina, G Medina-Tanco, VBB Mello, D Melo, A Menshikov, S Messina, MI Micheletti, L Middendorf, IA Minaya, L Miramonti, B Mitrica, L Molina-Bueno, S Mollerachl, F Montanet, C Morello, M Mostafa, CA Moura, G Mueller, MA Muller, S Mueller, I Naranjo, S Navas, P Necesal, L Nellen, A Nelles, J Neuser, PH Nguyen, M Niculescu-Oglinzanu, M Niechcio, L Niemietz, T Niggemann, D Nitz, D Nosek, V Novotny, H Nozka, LA Nunez, L Ochilo, F Oikonomou, A Olinto, N Pacheco, DP Selmi-Dei, M Palatka, J Pallotta, P Papenbreer, G Parente, A Parra, T Pau, M Pech, J Pekala, R Pelayo, J Pena-Rodriguez, IM Pepe, L Perrone, E Petermann, C Peters, S Petrera, J Phuntsok, R Piegaia, T Pierog, P Pieroni, M Pimenta, V Pirronello, M Platino, M Plum, C Porowski, RR Prado, P Privitera, M Prouza, EJ Quell, S Querchfeld, S Quinn, J Rautenberg, O Ravel, D Ravignani, D Reinert, B Revenu, J Ridky, M Risse, P Ristori, V Rizi, W Rodrigues de Carvalho, J Rodriguez Rojo, MD Rodriguez-Frias, D Rogozin, J Rosado, M Roth, E Roulet, AC Rovero, SJ Saffil, A Saftoiu, H Salazar, A Saleh, FS Greus, G Salina, JD Sanabria Gomez, F Sanchez, P Sanchez-Lucas, EM Santos, E Santos, F Sarazin, B Sarkar, R Sarmento, C Sarmiento-Cano, R Sato, C Scarso, M Schauer, V Scherini, H Schieler, D Schmidt, Scholtene, H Schoorlemmer, P Schovanek, FG Schroeder, A Schulz, J Schulz, J Schumacher, A Segreto, M Settimo, A Shadkam, RC Shellard, G Sigl, O Sima, A Smialkowski, R Smida, GR Snow, P Sommers, S Sonntag, J Sorokin, R Squartini, D Stanca, S Stanic, J Stapleton, J Stasielak, M Stephan, F Strafella, A Stutz, F Suarez, MS Duran, T Suomijarvi, AD Supanitsky, MS Sutherland, J Swain, Z Szadkowski, OA Taborda, A Tapia, A Tepe, VM Theodoro, C Timmermans, CJ Todero Peixoto, G Toma, L Tomankova, B Tome, A Tonachini, GT Elipe, D Torres Machado, P Travnicek, M Trini, R Ulrich, M Unger, M Urban, JFV Galicia, I Valino, L Valore, G van Aar, P van Bodegom, AM van den Berg, A van Vliet, E Varela, B Vargas Cardenas, G Varner, R Vasquez, JR Vazquez, RA Vazquez, D Veberic, V Verzi, J Vicha, M Videla, L Villasenor, S Vorobiov, H Wahlberg, O Wainberg, D Walz, AA Watson, M Weber, K Weidenhaupt, A Weindl, L Wiencke, H Wilczynski, T Winchen, D Wittkowski, B Wundheiler, S Wykes, L Yang, T Yapici, A Yushkov, E Zas, D Zavrtanik, M Zavrtanik, A Zepeda, B Zimmermann, M Ziolkowski, Z Zong, F Zuccarello, RU Abbasi, M Abe, T Abu-Zayyad, M Allen, R Azuma, E Barcikowski, JW Belz, DR Bergman, SA Blake, R Cady, MJ Chae, BG Cheon, J Chiba, M Chikawa, WR Cho, T Fujii, M Fukushima, T Gotoll, W Hanlon, Y Hayashi, N Hayashida, K Hibino, K Honda, D Ikeda, N Inoue, T Ishii, R Ishimori, H Ito, D Ivanov, CCH Jui, K Kadota, F Kakimoto, O Kalashev, K Kasahara, H Kawail, S Kawakami, S Kawana, K Kawata, E Kido, HB Kim, JH Kim, JH Kim, S Kitamura, Y Kitamura, V Kuzmin, YJ Kwon, J Lan, SI Lim, JP Lundquist, K Machida, K Martens, T Matsuda, T Matsuyama, JN Matthews, M Minamino, Y Mukai, I Myers, K Nagasawa, S Nagataki, T Nakamura, T Nonaka, A Nozato, S Ogioll, J Ogura, M Ohnishi, H Ohoka, K Oki, T Okuda, M Ono, A Oshima, S Ozawa, IH Park, MS Pshirkov, DC Rodriguez, G Rubtsov, D Ryu, H Sagawa, N Sakurai, LM Scott, PD Shah, F Shibata, T Shibata, H Shimodaira, BK Shins, HS Shin, JD Smith, P Sokolsky, RW Springer, BT Stokes, SR Stratton, TA Stroman, T Suzawa, M Takamura, M Takeda, R Takeishi, A Taketa, M Takita, Y Tameda, H Tanaka, K Tanaka, M Tanaka, SB Thomas, GB Thomson, P Tinyakov, I Tkachev, H Tokuno, T Tomida, S Troitsky, Y Tsunesada, K Tsutsumi, Y Uchihori, S Udo, F Urban, G Vasiloff, T Wong, R Yamane, H Yamaoka, K Yamazaki, J Yang, K Yashiro, Y Yoneda, S Yoshida, H Yoshii, R Zollinger, Z Zundel, I Collaboration, I Collaboration, PA Collaboration, PA Collaboration, TA Collaboration


The cosmic evolution of massive black holes in the Horizon-AGN simulation

Monthly Notices of the Royal Astronomical Society 460 (2016) 2979-2996

M Volonteri, Y Dubois, C Pichon, J Devriendt

© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.We analyse the demographics of black holes (BHs) in the large-volume cosmological hydrodynamical simulation Horizon-AGN. This simulation statistically models how much gas is accreted on to BHs, traces the energy deposited into their environment and, consequently, the back-reaction of the ambient medium on BH growth. The synthetic BHs reproduce a variety of observational constraints such as the redshift evolution of the BH mass density and the mass function. Strong self-regulation via AGN feedback, weak supernova feedback, and unresolved internal processes result in a tight BH-galaxy mass correlation. Starting at z ~ 2, tidal stripping creates a small population of BHs over-massive with respect to the halo. The fraction of galaxies hosting a central BH or an AGN increases with stellar mass. The AGN fraction agrees better with multi-wavelength studies, than single-wavelength ones, unless obscuration is taken into account. The most massive haloes present BH multiplicity, with additional BHs gained by ongoing or past mergers. In some cases, both a central and an off-centre AGN shine concurrently, producing a dual AGN. This dual AGN population dwindles with decreasing redshift, as found in observations. Specific accretion rate and Eddington ratio distributions are in good agreement with observational estimates. The BH population is dominated in turn by fast, slow, and very slow accretors, with transitions occurring at z = 3 and z = 2, respectively.


THE SEARCH FOR TRANSIENT ASTROPHYSICAL NEUTRINO EMISSION WITH ICECUBE-DEEPCORE

ASTROPHYSICAL JOURNAL 816 (2016) ARTN 75

MG Aartsen, K Abraham, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, D Altmann, T Anderson, I Ansseaus, M Archinger, C Arguelles, TC Arlen, J Auffenberg, X Bai, SW Barwick, V Baum, R Bay, JJ Beatty, JB Tjus, K-H Becker, E Beiser, S Benzvi, P Berghaus, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissoki, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, M Boerner, F Bos, D Bose, S Boeser, O Botner, J Braun, L Brayeur, H-P Bretz, N Buzinsky, J Casey, M Casier, E Cheung, D Chirkin, A Christov, K Clark, L Classen, S Coenders, DF Cowen, AHC Silva, J Daughhetee, JC Davis, M Day, JPAM de Andre, C De Clercq, E del Pino Rosendo, H Dembinski, S De Ridder, P Desiati, KD de Vries, G de Wasseige, M de With, T DeYoung, JC Diaz-Velez, V di Lorenzo, JP Dumm, M Dunkman, R Eagan, B Eberhardt, T Ehrhardt, B Eichmann, S Euler, PA Evenson, O Fadiran, S Fahey, AR Fazely, A Fedynitch, J Feintzeig, J Felde, K Filimonov, C Finley, T Fischer-Wasels, S Flis, C-C Foesig, T Fucus, TK Gaisser, R Gaior, J Gallagher, L Gerhardt, K Ghorbani, D Gier, L Gladstone, M Glagla, T Gluesenkamp, A Goldschmidt, G Golup, JG Gonzalez, D Gora, D Grant, JC Groii, A Gross, C Ha, C Haack, AH Ismail, A Hallgren, F Halzen, E Hansen, B Hansmann, K Hanson, D Hebecker, D Heereman, K Helbing, R Hellauer, S Hickford, J Hignigiit, GC Hill, KD Hoffman, R Hoffmann, K Holzapfel, A Homeier, K Hoshina, F Huang, M Huber, W Huelsnitz, PO Hulth, K Hultqvist, S In, A Ishihara, E Jacobi, GS Japaridze, K Jero, M Jurkovic, A Kappes, T Karg, A Karle, M Kauer, A Keivani, JL Kelley, J Kemp, A Kheirandish, J Kiryluk, J Klaes, SR Klein, G Kohnen, R Koirala, H Kolanoski, R Konietz, L Koepke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, K Krings, G Kroll, M Kroll, J Kunnen, N Kurahashi, T Kuwabara, M Labare, JL Lanfranchi, MJ Larson, M Lesiak-Bzdak, M Leuermann, J Leuner, L Lu, J Lunemann, J Madsen, G Maggi, KBM Mahn, R Maruyama, K Mase, HS Matis, R Maunu, F McNally, K Meagher, M Medici, A Meli, T Menne, G Merino, T Meuress, S Miarecki, E Middell, E Middlemas, L Mohrmann, T Montaruli, R Morse, R Nahnhauer, U Naumann, G Neer, H Niederhausen, SC Nowicki, DR Nygren, A Obertacke, A Olivas, A Omairat, A O'Murchadha, T Palczewski, H Pandya, DV Pankova, L Paul, JA Pepper, C Perez de los Heros, C Pfendner, D Pieloth, E Pinat, J Posselt, PB Price, GT Przybylski, J Puetz, M Quinnan, C Raab, L Raedel, M Rameez, K Rawlins, R Reimann, M Relich, E Resconi, W Rhode, M Richman, S Richter, B Riedel, S Robertson, M Rongen, C Rott, T Ruhe, D Ryckbosch, SM Saba, L Sabbatini, H-G Sander, A Sandrock, J Sandroos, S Sarkar, K Schatto, F Scheriau, M Schimp, T Schmidt, M Schmitz, S Schoenen, S Schoeneberg, A Schoenwald, L Schulte, D Seckel, S Seunarine, MWE Smith, D Soldin, M Song, GM Spiczak, C Spiering, M Stahlberg, M Stamatikos, T Stanev, NA Stanisha, A Stasik, T Stezelberger, RG Stokstad, A Stoessl, R Strom, NL Strotjohann, GW Sullivan, M Sutherland, H Taavola, I Taboada, J Tatar, S Ter-Antonyan, A Terliuk, G Tesic, S Tilav, PA Toale, MN Tobin, S Toscano, D Tosi, M Tselengidou, A Turcati, E Unger, M Usner, S Vallecorsa, J Vandenbroucke, N van Eundhoven, S Vanheule, J van Santen, J Veenkamp, M Vehring, M Voge, M Vraeghe, C Walck, A Wallace, M Wallraff, N Wandkowsky, C Weaver, C Wendt, S Westerhoff, BJ Whelan, N Whitehorn, K Wiebe, CH Wiebusch, L Wille, DR Williams, H Wissing, M Wolf, TR Wood, K Woschnagg, DL Xu, XW Xu, Y Xu, JP Yanez, G Yodh, S Yoshida, M Zoll


Modelling the circumstellar medium in RS Ophiuchi and its link to Type Ia supernovae

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 457 (2016) 822-835

RA Booth, S Mohamed, P Podsiadlowski


The nature and energetics of AGN-driven perturbations in the hot gas in the Perseus Cluster

Monthly Notices of the Royal Astronomical Society 458 (2016) 2902-2915

I Zhuravleva, E Churazov, P Arévalo, AA Schekochihin, WR Forman, SW Allen, A Simionescu, R Sunyaev, A Vikhlinin, N Werner

© 2016 The Authors.Cores of relaxed galaxy clusters are often disturbed by AGN. Their Chandra observations revealed a wealth of structures induced by shocks, subsonic gas motions, bubbles of relativistic plasma, etc. In this paper, we determine the nature and energy content of gas fluctuations in the Perseus core by probing statistical properties of emissivity fluctuations imprinted in the soft and hard-band X-ray images. About 80 per cent of the total variance of perturbations on ~8-70 kpc scales in the core have an isobaric nature, i.e. are consistent with subsonic displacements of the gas in pressure equilibrium with the ambient medium. The observed variance translates to the ratio of energy in perturbations to thermal energy of ~13 per cent. In the region dominated by weak 'ripples', about half of the total variance is associated with isobaric perturbations on scales of a few tens of kpc. If these isobaric perturbations are induced by buoyantly rising bubbles, then these results suggest that most of the AGN-injected energy should first go into bubbles rather than into shocks. Using simulations of a shock propagating through the Perseus atmosphere, we found that models reproducing the observed features of a central shock have more than 50 per cent of the AGN-injected energy associated with the bubble enthalpy and only about 20 per cent is carried away with the shock. Such energy partition is consistent with the AGN-feedback model, mediated by bubbles of relativistic plasma, and supports the importance of turbulence in the cooling-heating balance.


A laboratory model of post-Newtonian gravity with high power lasers and 4th generation light sources

Classical and Quantum Gravity 33 (2016)

G Gregori, MC Levy, MA Wadud, BJB Crowley, R Bingham

© 2016 IOP Publishing Ltd.Using the post-Newtonian formalism of gravity, we attempt to calculate the x-ray Thomson scattering cross section of electrons that are accelerated in the field of a high intensity optical laser. We show that our results are consistent with previous calculations, suggesting that the combination of high power laser and 4th generation light sources may become a powerful platform to test models exploring high order corrections to the Newtonian gravity.


The quiescent phase of galactic disc growth

Monthly Notices of the Royal Astronomical Society 459 (2016) 3326-3348

M Aumer, J Binney, R Schönrich

© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.We perform a series of controlled N-body simulations of growing disc galaxies within non-growing, live dark matter haloes of varying mass and concentration. Our initial conditions include either a low-mass disc or a compact bulge. New stellar particles are continuously added on near-circular orbits to the existing disc, so spiral structure is continuously excited. To study the effect of combined spiral and giant molecular cloud (GMC) heating on the discs, we introduce massive, short-lived particles that sample a GMC mass function. An isothermal gas component is introduced for a subset of the models. We perform a resolution study and vary parameters governing the GMC population, the histories of star formation and radial scale growth. Models with GMCs and standard values for the disc mass and halo density provide the right level of self-gravity to explain the age-velocity dispersion relation of the solar neighbourhood (Snhd). GMC heating generates remarkably exponential vertical profiles with scaleheights that are radially constant and agree with observations of galactic thin discs. GMCs are also capable of significantly delaying bar formation. The amount of spiral-induced radial migration agrees with what is required for the metallicity distribution of the Snhd. However, in our standard models, the outward-migrating populations are not hot enough vertically to create thick discs. Thick discs can form in models with high baryon fractions, but the corresponding bars are too long, the young stellar populations too hot and the discs flare considerably.


Search for astrophysical tau neutrinos in three years of IceCube data

PHYSICAL REVIEW D 93 (2016)

MG Aartsen, K Abraham, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, D Altmann, T Anderson, I Ansseau, M Archinger, C Arguelles, TC Arlen, J Auffenberg, X Bai, SW Barwick, V Baum, R Bay, JJ Beatty, JB Tjus, K-H Becker, E Beiser, S BenZvi, P Berghaus, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissok, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, M Boerner, F Bos, D Bose, S Boeser, O Botner, J Braun, L Brayeur, H-P Bretz, N Buzinsky, J Casey, M Casier, E Cheung, D Chirkin, A Christov, K Clark, L Classen, S Coenders, DF Cowen, AHC Silva, J Daughhetee, JC Davis, M Day, JPAM de Andre, C De Clercq, EDP Rosendo, H Dembinski, S De Ridder, P Desiati, KD de Vries, G de Wasseige, M de With, T De Young, JC Diaz-Velez, V di Lorenzo, JP Dumm, M Dunkman, R Eagan, B Eberhardt, T Ehrhardt, B Eichmann, S Euler, PA Evenson, O Fadiran, S Fahey, AR Fazely, A Fedynitch, J Feintzeig, J Felde, K Filimonov, C Finley, T Fischer-Wasels, S Flis, C-C Foesig, T Fuchs, TK Gaisser, R Gaior, J Gallagher, L Gerhardt, K Ghorbani, D Gier, L Gladstone, M Glagla, T Gluesenkamp, A Goldschmidt, G Golup, JG Gonzalez, D Gora, D Grant, JC Groh, A Gross, C Ha, C Haack, AH Ismail, A Hallgren, F Halzen, E Hansen, B Hansmann, K Hanson, D Hebecker, D Heereman, K Helbing, R Hellauer, S Hickford, J Hignight, GC Hill, KD Hoffman, R Hoffmann, K Holzapfel, A Homeier, K Hoshina, F Huang, M Huber, W Huelsnitz, PO Hulth, K Hultqvist, S In, A Ishihara, E Jacobi, GS Japaridze, K Jero, M Jurkovic, A Kappes, T Karg, A Karle, M Kauer, A Keivani, JL Kelley, J Kemp, A Kheirandish, J Kiryluk, J Klaes, SR Klein, G Kohnen, R Koirala, H Kolanoski, R Konietz, L Koepke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, K Krings, G Kroll, M Kroll, J Kunnen, N Kurahashi, T Kuwabara, M Labare, JL Lanfranchi, MJ Larson, M Lesiak-Bzdak, M Leuermann, J Leuner, L Lu, J Luenemann, J Madsen, G Maggi, KBM Mahn, R Maruyama, K Mase, HS Matis, R Maunu, F McNally, K Meagher, M Medici, A Meli, T Menne, G Merino, T Meures, S Miarecki, E Middell, E Middlemas, L Mohrmann, T Montaruli, R Morse, R Nahnhauer, U Naumann, G Neer, H Niederhausen, SC Nowicki, DR Nygren, A Obertacke, A Olivas, A Omairat, A O'Murchadha, T Palczewski, H Pandya, DV Pankova, L Paul, CPDL Heros, C Pfendner, D Pieloth, E Pinat, J Posselt, PB Price, GT Przybylski, J Puetz, M Quinnan, C Raab, L Raedel, M Rameez, K Rawlins, R Reimann, M Relich, E Resconi, W Rhode, M Richman, S Richter, B Riedel, S Robertson, M Rongen, C Rott, T Ruhe, D Ryckbosch, SM Saba, L Sabbatini, H-G Sander, A Sandrock, J Sandroos, S Sarkar, K Schatto, F Scheriau, M Schimp, T Schmidt, M Schmitz, S Schoenen, S Schoeneberg, A Schoenwald, L Schulte, D Seckel, S Seunarine, MWE Smith, D Soldin, M Song, GM Spiczak, C Spiering, M Stahlberg, M Stamatikos, T Stanev, NA Stanisha, A Stasik, T Stezelberger, RG Stokstad, A Stoessl, R Stroem, NL Strotjohann, GW Sullivan, M Sutherland, H Taavola, I Taboada, J Tatar, S Ter-Antonyan, A Terliuk, G Tesic, S Tilav, PA Toale, MN Tobin, S Toscano, D Tosi, M Tselengidou, A Turcati, E Unger, M Usner, S Vallecorsa, J Vandenbroucke, N van Eijndhoven, S Vanheule, J van Santen, J Veenkamp, M Vehring, M Voge, M Vraeghe, C Walck, A Wallace, M Wallraff, N Wandkowsky, C Weaver, C Wendt, S Westerhoff, BJ Whelan, N Whitehorn, K Wiebe, CH Wiebusch, L Wille, DR Williams, H Wissing, M Wolf, TR Wood, K Woschnagg, DL Xu, XW Xu, Y Xu, JP Yanez, G Yodh, S Yoshida, M Zoll, I Collaboration


Rejuvenation of stellar mergers and the origin of magnetic fields in massive stars

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 457 (2016) 2355-2365

FRN Schneider, P Podsiadlowski, N Langer, N Castro, L Fossati


THE FIRST COMBINED SEARCH for NEUTRINO POINT-SOURCES in the SOUTHERN HEMISPHERE with the ANTARES and ICECUBE NEUTRINO TELESCOPES

Astrophysical Journal 823 (2016)

S Adrián-Martínez, A Albert, M André, G Anton, M Ardid, JJ Aubert, B Baret, J Barrios-Martí, S Basa, V Bertin, S Biagi, R Bormuth, MC Bouwhuis, R Bruijn, J Brunner, J Busto, A Capone, L Caramete, J Carr, T Chiarusi, M Circella, R Coniglione, H Costantini, P Coyle, A Creusot, I Dekeyser, A Deschamps, G De Bonis, C Distefano, C Donzaud, D Dornic, D Drouhin, A Dumas, T Eberl, D Elsässer, A Enzenhöfer, K Fehn, I Felis, P Fermani, F Folger, LA Fusco, S Galatà, P Gay, S Geißelsöder, K Geyer, V Giordano, A Gleixner, R Gracia-Ruiz, K Graf, S Hallmann, H Van Haren, AJ Heijboer, Y Hello, JJ Hernández-Rey, J Hößl, J Hofestädt, C Hugon, CW James, MD Jong, M Kadler, O Kalekin, U Katz, D Kießling, P Kooijman, A Kouchner, M Kreter, I Kreykenbohm, V Kulikovskiy, R Lahmann, D Lefèvre, E Leonora, S Loucatos, M Marcelin, A Margiotta, A Marinelli, JA Martínez-Mora, A Mathieu, T Michael, P Migliozzi, A Moussa, C Mueller, E Nezri, GE PǍvǍlaş

© 2016. The American Astronomical Society. All rights reserved.We present the results of searches for point-like sources of neutrinos based on the first combined analysis of data from both the ANTARES and IceCube neutrino telescopes. The combination of both detectors, which differ in size and location, forms a window in the southern sky where the sensitivity to point sources improves by up to a factor of 2 compared with individual analyses. Using data recorded by ANTARES from 2007 to 2012, and by IceCube from 2008 to 2011, we search for sources of neutrino emission both across the southern sky and from a preselected list of candidate objects. No significant excess over background has been found in these searches, and flux upper limits for the candidate sources are presented for E -2.5 and E -2 power-law spectra with different energy cut-offs.


Marginal evidence for cosmic acceleration from Type Ia supernovae.

(2016)

JT Nielsen, A Guffanti, S Sarkar

The 'standard' model of cosmology is founded on the basis that the expansion rate of the universe is accelerating at present - as was inferred originally from the Hubble diagram of Type Ia supernovae. There exists now a much bigger database of supernovae so we can perform rigorous statistical tests to check whether these 'standardisable candles' indeed indicate cosmic acceleration. Taking account of the empirical procedure by which corrections are made to their absolute magnitudes to allow for the varying shape of the light curve and extinction by dust, we find, rather surprisingly, that the data are still quite consistent with a constant rate of expansion.


Evidence that the maximum electron energy in hotspots of FR II galaxies is not determined by synchrotron cooling

Monthly Notices of the Royal Astronomical Society 460 (2016) 3554-3562

AT Araudo, AR Bell, A Crilly, KM Blundell

© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.It has been suggested that relativistic shocks in extragalactic sources may accelerate the highest energy cosmic rays. The maximum energy to which cosmic rays can be accelerated depends on the structure of magnetic turbulence near the shock but recent theoretical advances indicate that relativistic shocks are probably unable to accelerate particles to energies much larger than a PeV. We study the hotspots of powerful radiogalaxies, where electrons accelerated at the termination shock emit synchrotron radiation. The turnover of the synchrotron spectrum is typically observed between infrared and optical frequencies, indicating that the maximum energy of non-thermal electrons accelerated at the shock is ≲ TeV for a canonical magnetic field of ~100 μG. Based on theoretical considerations we show that this maximum energy cannot be constrained by synchrotron losses as usually assumed, unless the jet density is unreasonably large and most of the jet upstream energy goes to non-thermal particles. We test this result by considering a sample of hotspots observed with high spatial resolution at radio, infrared and optical wavelengths.


Laboratory astrophysical collisionless shock experiments on Omega and NIF

Journal of Physics: Conference Series 688 (2016)

HS Park, JS Ross, CM Huntington, F Fiuza, D Ryutov, D Casey, RP Drake, G Fiksel, D Froula, G Gregori, NL Kugland, C Kuranz, MC Levy, CK Li, J Meinecke, T Morita, R Petrasso, C Plechaty, B Remington, Y Sakawa, A Spitkovsky, H Takabe, AB Zylstra

© Published under licence by IOP Publishing Ltd.We are performing scaled astrophysics experiments on Omega and on NIF. Laser driven counter-streaming interpenetrating supersonic plasma flows can be studied to understand astrophysical electromagnetic plasma phenomena in a controlled laboratory setting. In our Omega experiments, the counter-streaming flow plasma state is measured using Thomson scattering diagnostics, demonstrating the plasma flows are indeed super-sonic and in the collisionless regime. We observe a surprising additional electron and ion heating from ion drag force in the double flow experiments that are attributed to the ion drag force and electrostatic instabilities. [1] A proton probe is used to image the electric and magnetic fields. We observe unexpected large, stable and reproducible electromagnetic field structures that arise in the counter-streaming flows [2]. The Biermann battery magnetic field generated near the target plane, advected along the flows, and recompressed near the midplane explains the cause of such self-organizing field structures [3]. A D3He implosion proton probe image showed very clear filamentary structures; three-dimensional Particle-In-Cell simulations and simulated proton radiography images indicate that these filamentary structures are generated by Weibel instabilities and that the magnetization level (ratio of magnetic energy over kinetic energy in the system) is ∼0.01 [4]. These findings have very high astrophysical relevance and significant implications. We expect to observe true collisionless shock formation when we use >100 kJ laser energy on NIF.


Review of Particle Physics

Chin. Phys. C40 (2016) 10

C Patrignani, others


Sherlock et al. Reply:

Physical Review Letters 116 (2016)

M Sherlock, W Rozmus, EG Hill, SJ Rose


The XXL Survey: I. Scientific motivations - XMM-Newton observing plan - Follow-up observations and simulation programme

Astronomy and Astrophysics 592 (2016)

M Pierre, F Pacaud, C Adami, S Alis, B Altieri, N Baran, C Benoist, M Birkinshaw, A Bongiorno, MN Bremer, M Brusa, A Butler, P Ciliegi, L Chiappetti, N Clerc, PS Corasaniti, J Coupon, C De Breuck, J Democles, S Desai, J Delhaize, J Devriendt, Y Dubois, D Eckert, A Elyiv, S Ettori, A Evrard, L Faccioli, A Farahi, C Ferrari, F Finet, S Fotopoulou, N Fourmanoit, P Gandhi, F Gastaldello, R Gastaud, I Georgantopoulos, P Giles, L Guennou, V Guglielmo, C Horellou, K Husband, M Huynh, A Iovino, M Kilbinger, E Koulouridis, S Lavoie, AMC Le Brun, JP Le Fevre, C Lidman, M Lieu, CA Lin, A Mantz, BJ Maughan, S Maurogordato, IG McCarthy, S McGee, JB Melin, O Melnyk, F Menanteau, M Novak, S Paltani, M Plionis, BM Poggianti, D Pomarede, E Pompei, TJ Ponman, ME Ramos-Ceja, P Ranalli, D Rapetti, S Raychaudury, TH Reiprich, H Rottgering, E Rozo, E Rykoff, T Sadibekova, J Santos, JL Sauvageot, C Schimd, M Sereno, GP Smith, V Smolčić, S Snowden, D Spergel, S Stanford, J Surdej, P Valageas, A Valotti

© ESO, 2016.Context. The quest for the cosmological parameters that describe our universe continues to motivate the scientific community to undertake very large survey initiatives across the electromagnetic spectrum. Over the past two decades, the Chandra and XMM-Newton observatories have supported numerous studies of X-ray-selected clusters of galaxies, active galactic nuclei (AGNs), and the X-ray background. The present paper is the first in a series reporting results of the XXL-XMM survey; it comes at a time when the Planck mission results are being finalised. Aims. We present the XXL Survey, the largest XMM programme totaling some 6.9 Ms to date and involving an international consortium of roughly 100 members. The XXL Survey covers two extragalactic areas of 25 deg2 each at a point-source sensitivity of ∼5 × 10-15 erg s-1 cm-2 in the [0.5-2] keV band (completeness limit). The survey's main goals are to provide constraints on the dark energy equation of state from the space-time distribution of clusters of galaxies and to serve as a pathfinder for future, wide-area X-ray missions. We review science objectives, including cluster studies, AGN evolution, and large-scale structure, that are being conducted with the support of approximately 30 follow-up programmes. Methods. We describe the 542 XMM observations along with the associated multi-λ and numerical simulation programmes. We give a detailed account of the X-ray processing steps and describe innovative tools being developed for the cosmological analysis. Results. The paper provides a thorough evaluation of the X-ray data, including quality controls, photon statistics, exposure and background maps, and sky coverage. Source catalogue construction and multi-λ associations are briefly described. This material will be the basis for the calculation of the cluster and AGN selection functions, critical elements of the cosmological and science analyses. Conclusions. The XXL multi-λ data set will have a unique lasting legacy value for cosmological and extragalactic studies and will serve as a calibration resource for future dark energy studies with clusters and other X-ray selected sources. With the present article, we release the XMM XXL photon and smoothed images along with the corresponding exposure maps.


Proton imaging of an electrostatic field structure formed in laser-produced counter-streaming plasmas

Journal of Physics: Conference Series 688 (2016)

T Morita, NL Kugland, W Wan, R Crowston, RP Drake, F Fiuza, G Gregori, C Huntington, T Ishikawa, M Koenig, C Kuranz, MC Levy, D Martinez, J Meinecke, F Miniati, CD Murphy, A Pelka, C Plechaty, R Presura, N Quirós, BA Remington, B Reville, JS Ross, DD Ryutov, Y Sakawa, L Steele, H Takabe, Y Yamaura, N Woolsey, HS Park

© Published under licence by IOP Publishing Ltd.We report the measurements of electrostatic field structures associated with an electrostatic shock formed in laser-produced counter-streaming plasmas with proton imaging. The thickness of the electrostatic structure is estimated from proton images with different proton kinetic energies from 4.7 MeV to 10.7 MeV. The width of the transition region is characterized by electron scale length in the laser-produced plasma, suggesting that the field structure is formed due to a collisionless electrostatic shock.


High Orbital Angular Momentum Harmonic Generation

Physical Review Letters 117 (2016)

J Vieira, RMGM Trines, EP Alves, RA Fonseca, JT Mendonça, R Bingham, P Norreys, LO Silva

© 2016 American Physical Society.We identify and explore a high orbital angular momentum (OAM) harmonics generation and amplification mechanism that manipulates the OAM independently of any other laser property, by preserving the initial laser wavelength, through stimulated Raman backscattering in a plasma. The high OAM harmonics spectra can extend at least up to the limiting value imposed by the paraxial approximation. We show with theory and particle-in-cell simulations that the orders of the OAM harmonics can be tuned according to a selection rule that depends on the initial OAM of the interacting waves. We illustrate the high OAM harmonics generation in a plasma using several examples including the generation of prime OAM harmonics. The process can also be realized in any nonlinear optical Kerr media supporting three-wave interactions.